Discussion
Why must oxygen be excluded from the carrier gas?
Answer: A
Traces of oxygen oxidise the stationary phase whenever the oven is hot, raising the bleed and eventually destroying the column. Filament attack is a real hazard in a thermal conductivity detector but secondary, and neither absorption nor pressure is affected. An oxygen trap in the carrier line is standard, and a column that has lost its performance suddenly is often a leak that admitted air while the oven was hot. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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